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Does G use info from your Google My Business (GMB) page to rank your site?GMB info to rank the site? Not exactly.
If I use a US address, will it negatively impact my Canadian rankings?There have been a few discussions regarding multiple locations for a business. AFAIK the way GMB is currently set up, it works best to create a GMB listing for each location, using those addresses and link the listings to seperate biz pages.